Malware Analysis Report

2024-10-18 21:03

Sample ID 231222-e11x5sfcd4
Target 636e799e0d2695f6d1b4fc1c32f18b77
SHA256 cf25db6c63cc07611931c4c4468c4e15af04130d4534caa53f59a43f863a02d1
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

cf25db6c63cc07611931c4c4468c4e15af04130d4534caa53f59a43f863a02d1

Threat Level: Known bad

The file 636e799e0d2695f6d1b4fc1c32f18b77 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-22 04:25

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 04:25

Reported

2023-12-23 08:18

Platform

win7-20231215-en

Max time kernel

122s

Max time network

129s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\636e799e0d2695f6d1b4fc1c32f18b77.ps1

Signatures

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\636e799e0d2695f6d1b4fc1c32f18b77.ps1

Network

N/A

Files

memory/1700-4-0x000000001B4D0000-0x000000001B7B2000-memory.dmp

memory/1700-5-0x00000000022E0000-0x00000000022E8000-memory.dmp

memory/1700-7-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

memory/1700-6-0x00000000025A4000-0x00000000025A7000-memory.dmp

memory/1700-9-0x00000000025A0000-0x0000000002620000-memory.dmp

memory/1700-8-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 04:25

Reported

2023-12-23 08:18

Platform

win10v2004-20231215-en

Max time kernel

151s

Max time network

156s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\636e799e0d2695f6d1b4fc1c32f18b77.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3520 set thread context of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3520 wrote to memory of 4088 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\636e799e0d2695f6d1b4fc1c32f18b77.ps1

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

#cmd

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4088 -ip 4088

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4088 -s 1108

Network

Country Destination Domain Proto
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 211.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 174.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 153.141.79.40.in-addr.arpa udp

Files

memory/3520-0-0x00007FFD5C520000-0x00007FFD5CFE1000-memory.dmp

memory/3520-1-0x0000017CC5630000-0x0000017CC5640000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_u5ssfgqm.hqo.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3520-11-0x0000017CC7800000-0x0000017CC7822000-memory.dmp

memory/3520-12-0x0000017CC5630000-0x0000017CC5640000-memory.dmp

memory/3520-13-0x0000017CC7B70000-0x0000017CC7B96000-memory.dmp

memory/3520-14-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-15-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-17-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-19-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-21-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-23-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-25-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-27-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-29-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-31-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-33-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-35-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-37-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-51-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-49-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-53-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-47-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-45-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-43-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-41-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/3520-54-0x0000017CC7B90000-0x0000017CC7B91000-memory.dmp

memory/3520-39-0x0000017CC7B70000-0x0000017CC7B90000-memory.dmp

memory/4088-55-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4088-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4088-59-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3520-60-0x00007FFD5C520000-0x00007FFD5CFE1000-memory.dmp

memory/4088-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4088-64-0x0000000000400000-0x0000000000438000-memory.dmp